319 lines
11 KiB
JavaScript
319 lines
11 KiB
JavaScript
/**
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* CoolClock 2.1.4
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* Copyright 2010, Simon Baird
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* Released under the BSD License.
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*
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* Display an analog clock using canvas.
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* http://randomibis.com/coolclock/
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*
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*/
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// Constructor for CoolClock objects
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window.CoolClock = function(options) {
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return this.init(options);
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}
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// Config contains some defaults, and clock skins
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CoolClock.config = {
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tickDelay: 1000,
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longTickDelay: 15000,
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defaultRadius: 85,
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renderRadius: 100,
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defaultSkin: "chunkySwiss",
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// Should be in skin probably...
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// (TODO: allow skinning of digital display)
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showSecs: true,
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showAmPm: true,
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skins: {
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// There are more skins in moreskins.js
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// Try making your own skin by copy/pasting one of these and tweaking it
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swissRail: {
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outerBorder: { lineWidth: 2, radius:95, color: "black", alpha: 1 },
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smallIndicator: { lineWidth: 2, startAt: 88, endAt: 92, color: "black", alpha: 1 },
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largeIndicator: { lineWidth: 4, startAt: 79, endAt: 92, color: "black", alpha: 1 },
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hourHand: { lineWidth: 8, startAt: -15, endAt: 50, color: "black", alpha: 1 },
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minuteHand: { lineWidth: 7, startAt: -15, endAt: 75, color: "black", alpha: 1 },
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secondHand: { lineWidth: 1, startAt: -20, endAt: 85, color: "red", alpha: 1 },
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secondDecoration: { lineWidth: 1, startAt: 70, radius: 4, fillColor: "red", color: "red", alpha: 1 }
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},
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chunkySwiss: {
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outerBorder: { lineWidth: 4, radius:97, color: "black", alpha: 1 },
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smallIndicator: { lineWidth: 4, startAt: 89, endAt: 93, color: "black", alpha: 1 },
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largeIndicator: { lineWidth: 8, startAt: 80, endAt: 93, color: "black", alpha: 1 },
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hourHand: { lineWidth: 12, startAt: -15, endAt: 60, color: "black", alpha: 1 },
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minuteHand: { lineWidth: 10, startAt: -15, endAt: 85, color: "black", alpha: 1 },
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secondHand: { lineWidth: 4, startAt: -20, endAt: 85, color: "red", alpha: 1 },
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secondDecoration: { lineWidth: 2, startAt: 70, radius: 8, fillColor: "red", color: "red", alpha: 1 }
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},
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chunkySwissOnBlack: {
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outerBorder: { lineWidth: 4, radius:97, color: "white", alpha: 1 },
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smallIndicator: { lineWidth: 4, startAt: 89, endAt: 93, color: "white", alpha: 1 },
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largeIndicator: { lineWidth: 8, startAt: 80, endAt: 93, color: "white", alpha: 1 },
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hourHand: { lineWidth: 12, startAt: -15, endAt: 60, color: "white", alpha: 1 },
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minuteHand: { lineWidth: 10, startAt: -15, endAt: 85, color: "white", alpha: 1 },
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secondHand: { lineWidth: 4, startAt: -20, endAt: 85, color: "red", alpha: 1 },
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secondDecoration: { lineWidth: 2, startAt: 70, radius: 8, fillColor: "red", color: "red", alpha: 1 }
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}
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},
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// Test for IE so we can nurse excanvas in a couple of places
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isIE: !!document.all,
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// Will store (a reference to) each clock here, indexed by the id of the canvas element
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clockTracker: {},
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// For giving a unique id to coolclock canvases with no id
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noIdCount: 0
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};
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// Define the CoolClock object's methods
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CoolClock.prototype = {
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// Initialise using the parameters parsed from the colon delimited class
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init: function(options) {
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// Parse and store the options
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this.canvasId = options.canvasId;
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this.skinId = options.skinId || CoolClock.config.defaultSkin;
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this.displayRadius = options.displayRadius || CoolClock.config.defaultRadius;
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this.showSecondHand = typeof options.showSecondHand == "boolean" ? options.showSecondHand : true;
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this.gmtOffset = (options.gmtOffset != null && options.gmtOffset != '') ? parseFloat(options.gmtOffset) : null;
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this.showDigital = typeof options.showDigital == "boolean" ? options.showDigital : false;
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this.logClock = typeof options.logClock == "boolean" ? options.logClock : false;
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this.logClockRev = typeof options.logClock == "boolean" ? options.logClockRev : false;
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this.tickDelay = CoolClock.config[ this.showSecondHand ? "tickDelay" : "longTickDelay" ];
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// Get the canvas element
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this.canvas = document.getElementById(this.canvasId);
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// Make the canvas the requested size. It's always square.
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this.canvas.setAttribute("width",this.displayRadius*2);
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this.canvas.setAttribute("height",this.displayRadius*2);
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this.canvas.style.width = this.displayRadius*2 + "px";
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this.canvas.style.height = this.displayRadius*2 + "px";
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// Explain me please...?
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this.renderRadius = CoolClock.config.renderRadius;
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this.scale = this.displayRadius / this.renderRadius;
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// Initialise canvas context
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this.ctx = this.canvas.getContext("2d");
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this.ctx.scale(this.scale,this.scale);
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// Keep track of this object
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CoolClock.config.clockTracker[this.canvasId] = this;
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// Start the clock going
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this.tick();
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return this;
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},
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// Draw a circle at point x,y with params as defined in skin
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fullCircleAt: function(x,y,skin) {
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this.ctx.save();
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this.ctx.globalAlpha = skin.alpha;
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this.ctx.lineWidth = skin.lineWidth;
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if (!CoolClock.config.isIE) {
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this.ctx.beginPath();
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}
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if (CoolClock.config.isIE) {
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// excanvas doesn't scale line width so we will do it here
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this.ctx.lineWidth = this.ctx.lineWidth * this.scale;
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}
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this.ctx.arc(x, y, skin.radius, 0, 2*Math.PI, false);
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if (CoolClock.config.isIE) {
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// excanvas doesn't close the circle so let's fill in the tiny gap
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this.ctx.arc(x, y, skin.radius, -0.1, 0.1, false);
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}
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if (skin.fillColor) {
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this.ctx.fillStyle = skin.fillColor
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this.ctx.fill();
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}
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else {
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// XXX why not stroke and fill
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this.ctx.strokeStyle = skin.color;
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this.ctx.stroke();
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}
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this.ctx.restore();
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},
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// Draw some text centered vertically and horizontally
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drawTextAt: function(theText,x,y) {
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this.ctx.save();
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this.ctx.font = '15px sans-serif';
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var tSize = this.ctx.measureText(theText);
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if (!tSize.height) tSize.height = 15; // no height in firefox.. :(
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this.ctx.fillText(theText,x - tSize.width/2,y - tSize.height/2);
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this.ctx.restore();
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},
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lpad2: function(num) {
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return (num < 10 ? '0' : '') + num;
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},
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tickAngle: function(second) {
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// Log algorithm by David Bradshaw
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var tweak = 3; // If it's lower the one second mark looks wrong (?)
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if (this.logClock) {
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return second == 0 ? 0 : (Math.log(second*tweak) / Math.log(60*tweak));
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}
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else if (this.logClockRev) {
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// Flip the seconds then flip the angle (trickiness)
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second = (60 - second) % 60;
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return 1.0 - (second == 0 ? 0 : (Math.log(second*tweak) / Math.log(60*tweak)));
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}
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else {
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return second/60.0;
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}
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},
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timeText: function(hour,min,sec) {
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var c = CoolClock.config;
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return '' +
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(c.showAmPm ? ((hour%12)==0 ? 12 : (hour%12)) : hour) + ':' +
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this.lpad2(min) +
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(c.showSecs ? ':' + this.lpad2(sec) : '') +
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(c.showAmPm ? (hour < 12 ? ' am' : ' pm') : '')
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;
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},
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// Draw a radial line by rotating then drawing a straight line
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// Ha ha, I think I've accidentally used Taus, (see http://tauday.com/)
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radialLineAtAngle: function(angleFraction,skin) {
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this.ctx.save();
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this.ctx.translate(this.renderRadius,this.renderRadius);
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this.ctx.rotate(Math.PI * (2.0 * angleFraction - 0.5));
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this.ctx.globalAlpha = skin.alpha;
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this.ctx.strokeStyle = skin.color;
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this.ctx.lineWidth = skin.lineWidth;
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if (CoolClock.config.isIE)
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// excanvas doesn't scale line width so we will do it here
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this.ctx.lineWidth = this.ctx.lineWidth * this.scale;
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if (skin.radius) {
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this.fullCircleAt(skin.startAt,0,skin)
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}
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else {
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this.ctx.beginPath();
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this.ctx.moveTo(skin.startAt,0)
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this.ctx.lineTo(skin.endAt,0);
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this.ctx.stroke();
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}
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this.ctx.restore();
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},
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render: function(hour,min,sec) {
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// Get the skin
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var skin = CoolClock.config.skins[this.skinId];
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if (!skin) skin = CoolClock.config.skins[CoolClock.config.defaultSkin];
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// Clear
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this.ctx.clearRect(0,0,this.renderRadius*2,this.renderRadius*2);
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// Draw the outer edge of the clock
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if (skin.outerBorder)
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this.fullCircleAt(this.renderRadius,this.renderRadius,skin.outerBorder);
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// Draw the tick marks. Every 5th one is a big one
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for (var i=0;i<60;i++) {
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(i%5) && skin.smallIndicator && this.radialLineAtAngle(this.tickAngle(i),skin.smallIndicator);
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!(i%5) && skin.largeIndicator && this.radialLineAtAngle(this.tickAngle(i),skin.largeIndicator);
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}
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// Write the time
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if (this.showDigital) {
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this.drawTextAt(
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this.timeText(hour,min,sec),
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this.renderRadius,
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this.renderRadius+this.renderRadius/2
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);
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}
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// Draw the hands
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if (skin.hourHand)
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this.radialLineAtAngle(this.tickAngle(((hour%12)*5 + min/12.0)),skin.hourHand);
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if (skin.minuteHand)
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this.radialLineAtAngle(this.tickAngle((min + sec/60.0)),skin.minuteHand);
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if (this.showSecondHand && skin.secondHand)
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this.radialLineAtAngle(this.tickAngle(sec),skin.secondHand);
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// Second hand decoration doesn't render right in IE so lets turn it off
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if (!CoolClock.config.isIE && this.showSecondHand && skin.secondDecoration)
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this.radialLineAtAngle(this.tickAngle(sec),skin.secondDecoration);
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},
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// Check the time and display the clock
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refreshDisplay: function() {
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var now = new Date();
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if (this.gmtOffset != null) {
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// Use GMT + gmtOffset
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var offsetNow = new Date(now.valueOf() + (this.gmtOffset * 1000 * 60 * 60));
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this.render(offsetNow.getUTCHours(),offsetNow.getUTCMinutes(),offsetNow.getUTCSeconds());
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}
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else {
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// Use local time
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this.render(now.getHours(),now.getMinutes(),now.getSeconds());
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}
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},
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// Set timeout to trigger a tick in the future
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nextTick: function() {
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setTimeout("CoolClock.config.clockTracker['"+this.canvasId+"'].tick()",this.tickDelay);
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},
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// Check the canvas element hasn't been removed
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stillHere: function() {
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return document.getElementById(this.canvasId) != null;
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},
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// Main tick handler. Refresh the clock then setup the next tick
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tick: function() {
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if (this.stillHere()) {
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this.refreshDisplay()
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this.nextTick();
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}
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}
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};
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// Find all canvas elements that have the CoolClock class and turns them into clocks
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CoolClock.findAndCreateClocks = function() {
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// (Let's not use a jQuery selector here so it's easier to use frameworks other than jQuery)
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var canvases = document.getElementsByTagName("canvas");
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for (var i=0;i<canvases.length;i++) {
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// Pull out the fields from the class. Example "CoolClock:chunkySwissOnBlack:1000"
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var fields = canvases[i].className.split(" ")[0].split(":");
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if (fields[0] == "CoolClock") {
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if (!canvases[i].id) {
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// If there's no id on this canvas element then give it one
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canvases[i].id = '_coolclock_auto_id_' + CoolClock.config.noIdCount++;
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}
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// Create a clock object for this element
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new CoolClock({
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canvasId: canvases[i].id,
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skinId: fields[1],
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displayRadius: fields[2],
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showSecondHand: fields[3]!='noSeconds',
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gmtOffset: fields[4],
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showDigital: fields[5]=='showDigital',
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logClock: fields[6]=='logClock',
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logClockRev: fields[6]=='logClockRev'
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});
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}
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}
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};
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// If you don't have jQuery then you need a body onload like this: <body onload="CoolClock.findAndCreateClocks()">
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// If you do have jQuery and it's loaded already then we can do it right now
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if (window.jQuery) jQuery(document).ready(CoolClock.findAndCreateClocks);
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